( I20 ) 



TABLE XX. 



SysteiiuUic Survey of the Phyhgenetic Classification of 



Vertebrates. 



I. SkuII4ess (Acrania), or ^ubc-f)eartet( (Leptocardia). 

 Vertebrates without a specialized head, skull, brain, or centralized heart. 



1. &ku\Ultss 

 Aorania 



I. Tube-hearted 

 Leptocardia 



1. Lancelets 



1. Amphioxida 



II. Animals hittfj skulls (Craniota) and with centraltjeti fjearts (Pachycardia). 

 Vertebrates with specialized head, with skull and brain, and with a 



centralized heart. 



Main-clasiet 



of the 



Skulled Animals. 



Classes 



of the 



Skulled Aninals. 



Sub-classes 



of the 



Skulled Animal*. 



Systematic NaToe 



of the 



Sub-class€t. 



2. 5mglc= 

 0ostrilktJ 

 Monorhina 



3. yon« 

 atnnionatt 

 Anaimiia 



II. Round mouths 

 Cyclostoma 



III. Fishes 

 Pisces 



IV. Mud-fishes 

 Dipneusta 



V. Batrachians 

 Aviphihia 



k *atnnton5 

 "Knimals 

 Amniota 



VI. Reptiles 

 Beptilia 



VII. Birds 



Aves 



VIII. Mammals 

 Marrnnalia 



2. Hags, or 



Mucous Fish 



3. Lampreys 



4. Primitive Fish 



5. Ganoid Fish 



6. Osseous Fish 



7. Single-lunged 



8. Double -lunged 



9. Mailed Batra- 



chians 

 10. Naked Batra- 

 chians 



^IL Lizards 



12. Snakes 



13. Crocodiles 



14. Tortoises 



15. Sea -dragons 



16. Dragons 



17- FlyiugKeptiles 



18. BeakedAninials 



19. Long-tailed 



20. Fan.tailed 



21. Bush-tailed 



/22. Cloacal Animals 



23. Pouched Ani- 

 mals 



24. Placental Ani- 

 mals 



1 



2. Hyperotreta 

 (Myxinoida) 



3. Hyperoartia 

 (Petromyzontia) 



4. Selachii 



5. Ganoides 



6. Teleostei 



T.lMonopneumonee 



8. Dipneumones 



9. Phractamphibia 



10. Lissamphibia 



11. Lacertilia 



12. Ophidia 

 18. Crocodilia 



14. Chelonia 



15. Halisauria 



16. Dinosauria 



17. Pterosauria 



18. Anomodonta 



19. SaururaB 



20. Carinatae 



21. Ratitas 



22. Monotrema 



23. Marsupialia 



24. Placent&lia 



